JP5729949B2 - Imaging apparatus, control method thereof, and program - Google Patents

Description

  The present invention provides a mode for forming an anterior segment of an eye to be imaged on the imaging means, a mode for performing at least one of observation and photographing of the fundus of the eye to be examined, and photographing of the anterior segment. The present invention relates to a technique of an imaging apparatus including a mode for performing.

  A fundus camera that observes and photographs the fundus of the subject's eye performs fundus observation by sharing the photographing optical system, or inserts an auxiliary lens called an anterior ocular lens into the photographing optical system so that the anterior eye portion is placed on the imaging surface. In general, anterior segment alignment is performed by forming an image.

  Patent Document 1 discloses a configuration in which an examiner easily aligns the anterior segment of an eye to be examined. That is, the invention disclosed in Patent Document 1 is configured to drive the focus lens so that an appropriate working distance is obtained when anterior segment alignment is performed from fundus observation. Furthermore, when the fundus observation is switched to the anterior ocular segment alignment and the fundus observation again, the fundus observation is facilitated by returning the focus lens to the original position.

JP-A-3-97437

  In the invention disclosed in Patent Document 1, when switching the mode from fundus oculi observation to anterior ocular segment alignment or from anterior ocular segment alignment to fundus oculi observation, the focus lens is easily operated in a simple configuration without operating the focus lens. It is very useful because it can be switched.

  On the other hand, in general, when photographing the anterior segment with a fundus camera, a method is known in which a diopter correction lens is inserted, the focus is moved, and the stage is further moved backward to photograph the anterior segment. . In this way, in the case of a fundus camera configured in the fundus observation imaging mode, the anterior ocular segment alignment mode, and the anterior ocular segment imaging mode, the anterior ocular segment imaging mode is not taken into consideration. You must operate the focus lens. Further, when the anterior eye photographing mode is shifted to the fundus oculi observation photographing mode, the focus lens may be moved to a position different from the original position. Therefore, when the examiner returns to the fundus observation photographing mode, the examiner needs to adjust the focus lens again, and the examiner may be confused because the focus operation is different for each mode.

  Accordingly, an object of the present invention is to provide a mode for forming an anterior eye portion of an eye to be imaged on an imaging unit, a mode for performing at least one of observation and photographing of the fundus of the eye to be examined, It is to maintain continuity of a series of operations in an imaging apparatus including a mode for performing imaging.

The imaging apparatus of the present invention includes a focus lens that can move on the optical axis between the eye to be examined and the imaging means, an anterior ocular segment observation lens for forming an image of the anterior eye portion of the eye to be examined on the imaging means, When the anterior ocular segment observation lens is inserted on the optical axis, the focus lens is moved to a predetermined position on the optical axis, and the anterior ocular segment observation lens is retracted from the optical axis. when said of the fundus diopter correction lens for correcting the diopter of the subject's eye after being captured has been inserted on the optical axis by the imaging means, the focusing lens of the predetermined And a control unit that moves the anterior ocular segment observation lens to a diopter correct position that is a position corresponding to a state in which the anterior ocular segment observation lens is retracted from the optical axis .

  According to the present invention, a mode for imaging the anterior eye portion of the eye to be examined on the imaging means, a mode for performing at least one of observation and photographing of the fundus of the eye to be examined, and photographing of the anterior eye portion are performed. It is possible to maintain the continuity of a series of operations in the imaging apparatus having the mode to be performed.

It is a figure which shows the structure of the fundus camera which concerns on embodiment of this invention. It is a flowchart which shows the process of the fundus camera which concerns on embodiment of this invention. It is a flowchart which shows the process of the fundus camera which concerns on embodiment of this invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments to which the invention is applied will be described in detail with reference to the accompanying drawings.

  First, a first embodiment of the present invention will be described. The fundus camera according to the present embodiment includes a fundus observation photographing mode, an anterior eye alignment mode (also referred to as an anterior eye observation mode), and an anterior eye photographing mode. The anterior ocular segment alignment mode is an application example of the first mode, the fundus oculi observation imaging mode is an application example of the second mode, and the anterior ocular segment imaging mode is an application example of the third mode.

FIG. 1 is a diagram schematically illustrating a configuration of a fundus camera according to the present embodiment.
In the fundus camera shown in FIG. 1, the objective lens 1 is disposed facing the eye E to be examined. Further, on the optical axis L _H , the imaging lens 2, the focus lens 27 movable on the optical axis L _H , and the anterior ocular segment observation lens 3 detachably arranged are similarly detachably arranged. A diopter correction lens 4 and an image sensor 5 are provided. Furthermore, an anterior eye portion illumination infrared LED 6 for irradiating the anterior eye portion of the eye E to be examined is provided at a substantially peripheral portion of the objective lens 1. Also, perforated mirror 7 is obliquely to the Dohikarijiku L _H.

An observation photographing optical system is constituted by the objective lens 1 to the imaging lens 2, and an observation photographing optical system is constituted by the observation photographing optical system and the imaging element 5. On the optical axis L _V in the direction of reflection of the perforated mirror 7, a lens 8, a lens 9 and the condenser lens 10 is provided. Furthermore, on Dohikarijiku L _V, the imaging white LED11 and observation infrared LED12 is provided to be switchable.

  An illumination optical system is constituted by the objective lens 1 to the condenser lens 10. The illumination optical system, the photographing white LED 11 and the observation infrared LED 12 constitute an illumination system. The observation imaging system and the illumination system constitute a fundus camera optical unit. The fundus camera optical unit is placed on a slide (not shown) so that it can be aligned with the eye E.

  The output of the image sensor 5 is converted into a digital signal by the A / D converter 14 and stored in the memory 15 and connected to the photometric value calculator 16, which respectively controls the controller 23 that controls the entire apparatus. It is connected. An image memory 25 is connected to the controller 23, and a still image captured by the image sensor 5 is stored as digital image data.

  In addition to the image sensor 5, the A / D converter 14, the memory 15, and the photometric value calculation unit 16, a monitor 13 for displaying an infrared observation image, a visible photographed image, and the like imaged by the image sensor 5, and imaging control An imaging system is configured together with the unit 17. Further, the imaging system is detachably fixed by a housing of the fundus camera optical unit and a mount unit (not shown).

  The anterior ocular segment observation lens 3, the diopter correction lens 4 and the focus lens 27 are moved under the control of the anterior ocular segment observation lens control unit 18, the diopter correction lens control unit 19 and the focus lens control unit 28, respectively. In addition, lighting of the anterior segment illumination infrared LED 6 is controlled by the control of the anterior segment illumination infrared LED control unit 22. Further, the lighting white LED 11 and the observation infrared LED 12 are controlled to be turned on under the control of the shooting white LED control unit 20 and the observation infrared LED control unit 21, respectively. Further, the switching between the photographing white LED 11 and the observation infrared LED 12 is controlled by the photographing white LED control unit 20 and the observation infrared LED control unit 21.

  Next, processing in the fundus observation photographing mode, the anterior ocular segment alignment mode, and the anterior ocular segment photographing mode by the fundus camera according to the present embodiment will be described with reference to FIGS. 2 and 3 are flowcharts showing processing of the fundus camera according to the present embodiment.

The examiner decides whether to perform anterior segment imaging of the eye E or fundus imaging. Here, a case where the examiner first decides to perform fundus imaging will be described. The examiner determines from the observation image displayed on the monitor 13 whether the anterior ocular segment observation lens 3 is inserted. When the anterior ocular segment observation lens 3 is not inserted on the optical axis L _H , the examiner performs an operation for inserting the anterior ocular segment observation lens 3 on the optical axis L _H. Thereby, the anterior ocular segment observation lens control unit 18 inserts the anterior ocular segment observation lens 3 on the optical axis L _H. And it transfers to the anterior ocular segment alignment mode.

  The focus lens control unit 28 moves the focus lens 27 to the 0D (zero diopter) position (step S201). Next, the observation infrared LED control unit 21 stops light emission of the observation infrared LED 12, and the anterior eye illumination infrared LED control unit 22 starts light emission of the anterior eye illumination infrared LED 6 ( Step S202).

Examiner, for a fundus of the eye E, by performing a rough alignment of the center and the optical axis L _V of the eye E, called rough alignment, imaging of the imaging element 5 anterior segment Form an image on the surface. Do. The examiner performs the rough alignment success determination from the captured image displayed on the monitor 13. The anterior segment alignment mode is continued until the rough alignment is successful. When rough alignment is successful, the examiner performs an operation for retracting the anterior segment observation lens 3 from the optical axis L _H. Thereby, the anterior ocular segment observation lens control unit 18 retracts the anterior ocular segment observation lens 3 from the optical axis L _H. Then, a transition is made from the anterior segment alignment mode to the fundus observation imaging mode.

Control unit 23 waits for the anterior segment observation lens 3 is retracted from the optical axis L _H (step S203). When the anterior ocular segment observation lens 3 is retracted from the optical axis L _H , the anterior ocular segment illumination infrared LED control unit 22 stops the emission of the anterior ocular segment illumination infrared LED 6 and the observation infrared region. The LED control unit 21 starts light emission from the observation infrared LED 12 (step S204).

  The control unit 23 determines whether or not there is a fundus observation history of the subject. This determination is performed by, for example, determining whether the fundus observation history is managed in the memory 24 in association with the identification information of the subject in the memory 24. When there is a fundus observation history of the subject, the examiner performs an operation of moving the focus lens 27 to a position indicated by the fundus observation history. Thereby, the focus lens control unit 28 moves the focus lens 27 to the position (step S206). On the other hand, when there is no fundus observation history of the subject, that is, when the fundus of the subject's eye E is observed for the first time, the examiner moves the focus lens 27 while checking the fundus image on the monitor 13. Then, alignment is performed with more detailed positioning. When the position of the focus lens 27 is determined, the control unit 23 associates the position of the focus lens 27 with the identification information of the subject in the memory 24 based on the information obtained from the focus lens control unit 28. It manages as observation history (step S207).

The examiner confirms on the monitor 13 whether an index used for alignment is visible. This index becomes invisible when it is greatly deviated from the alignment during rough alignment. If the index has become invisible, the examiner performs an operation of inserting the anterior eye segment observation lens 3 again on the optical axis L _H. Thereby, the anterior ocular segment observation lens control unit 18 inserts the anterior ocular segment observation lens 3 on the optical axis L _H.

The control unit 23 determines whether or not the anterior segment observation lens 3 is inserted on the optical axis L _H (step S208). When the anterior ocular segment observation lens 3 is inserted on the optical axis L _H, it returns to anterior ocular segment alignment mode. That is, the focus lens 27 is moved to the 0D position (step S201), and the rough alignment is performed again. On the other hand, when the anterior ocular segment observation lens 3 is not inserted on the optical axis L _H , the examiner checks on the monitor 13 whether or not it is in focus, and is in focus and ready for photographing. If it is determined that the shooting switch 26 is in the position, the photographing switch 26 is operated. If the focus is not correct, the examiner moves the focus lens 27 while checking the fundus image on the monitor 13 and positions the focus lens 27. The association between the position determined here and the identification information of the subject is overwritten as the fundus observation history of the subject.

  The control unit 23 waits for an operation of the photographing switch 26 (step S209). When the photographing switch 26 is operated, the photographing white LED control unit 20 causes the photographing white LED 11 to emit light (step S210). The imaging control unit 17 performs imaging using the imaging element 5 in accordance with the light emission timing of the imaging white LED 11 (step S211).

The examiner determines whether to continue photographing the fundus. When performing fundus photographing continues, the examiner performs an operation of inserting the anterior eye segment observation lens 3 on the optical axis L _H. Thereby, the anterior ocular segment observation lens control unit 18 inserts the anterior ocular segment observation lens 3 on the optical axis L _H. The control unit 23 determines whether or not the anterior ocular segment observation lens 3 is inserted on the optical axis L _H (step S212). When the anterior ocular segment observation lens 3 is inserted on the optical axis L _H , the mode shifts to the anterior ocular segment alignment mode, the focus lens 27 is moved to the 0D position (step S201), and the rough alignment is performed again.

On the other hand, if the examiner determines that exit the fundus photography, performing anterior segment imaging, the examiner performs an operation of inserting the diopter compensation lens 4 on the optical axis L _H. Thereby, the diopter correction lens control unit 19 inserts the diopter correction lens 4 on the optical axis L _H. Meanwhile, the examiner determines not to perform anterior segment imaging, in the case of performing the termination operation, the diopter compensation lens 4 is not inserted on the optical axis L _H.

Control unit 23 determines whether the diopter compensation lens 4 is inserted on the optical axis L _H (step S213). It is determined to perform the anterior segment captured by the examiner, if diopter compensation lens 4 is inserted on the optical axis L _H, transitions from the fundus observation photographing mode to the anterior segment imaging mode. On the other hand, when it is determined by the examiner that the anterior segment imaging is not performed and the diopter correction lens 4 is not inserted on the optical axis L _H , the control unit 23 stores the subject stored in the memory 24. Is reset (step S214). This completes the inspection.

Next, the anterior segment imaging mode will be described. Anterior segment imaging mode, the examiner starts by inserting the diopter compensation lens 4 on the optical axis L _H.

When the control unit 23 detects that the diopter correction lens 4 is inserted on the optical axis L _H , the focus lens control unit 28 moves the focus lens 27 to the diopter correct position (step S301). The observation infrared LED control unit 21 starts light emission of the observation infrared LED 12 (step S302). The anterior ocular segment observation lens control unit 18 retracts the anterior ocular segment observation lens 3 from the optical axis L _H (step S303).

The examiner performs alignment by moving the optical axis L _H to the vicinity of the center of the position where the anterior segment is desired to be photographed. Alignment is performed until successful, and when the alignment is successful, the examiner operates the imaging switch 26. The control unit 23 waits for an operation of the photographing switch 26 (step S304). When the photographing switch 26 is operated, the photographing white LED control unit 20 causes the photographing white LED 11 to emit light (step S305). The imaging control unit 17 performs imaging using the imaging element 5 in accordance with the light emission timing of the imaging white LED 11 (step S306).

The examiner determines whether or not to continue photographing the anterior segment. When the anterior segment imaging is subsequently performed, the examiner performs alignment again and performs imaging again. On the other hand, when determining that the anterior ocular segment imaging is to be terminated, the examiner determines whether to perform fundus imaging. If fundus photography is not performed, the examiner performs an end operation. In response to this ending operation, the control unit 23 resets the fundus observation history of the subject stored in the memory 24 (step S308). This completes the inspection. Meanwhile, the examiner, when it is determined to perform the fundus photographing, performs an operation of inserting the anterior eye segment observation lens 3 on the optical axis L _H. Thereby, the anterior ocular segment observation lens control unit 18 inserts the anterior ocular segment observation lens 3 on the optical axis L _H. Then, the anterior segment imaging mode is shifted to the anterior segment alignment mode.

  As described above, in the present embodiment, the optimal focus lens position is set in correspondence with the anterior segment alignment mode, fundus observation imaging mode, and anterior segment imaging mode, and when the mode is shifted to each mode, the corresponding position is set. The focus lens is moved. Accordingly, it is possible to maintain the continuity of a series of operations in the fundus camera including the anterior segment alignment mode, the fundus observation imaging mode, and the anterior segment imaging mode.

  Next, a second embodiment of the present invention will be described. The configuration of the fundus camera according to the second embodiment is the same as the configuration shown in FIG. Below, the case of the process of 1st Embodiment and 2nd Embodiment is demonstrated.

  In the second embodiment, the focus lens 27 can be moved in the anterior segment imaging mode. For example, when the focus lens 27 is moved from the diopter normal position to another position in the anterior ocular segment shooting mode, the position of the focus lens 27 in the anterior ocular segment shooting mode is changed from the diopter correct position to the other position. Set. When returning to the anterior ocular segment photographing mode from another mode, the focus lens 27 is moved to the reset position.

  Next, a third embodiment of the present invention will be described. Note that the configuration of the fundus camera according to the third embodiment is the same as the configuration shown in FIG. In the following, a difference in processing between the first embodiment and the third embodiment will be described.

  In the first embodiment, the left and right eyes can be aligned by the sliding mechanism. On the other hand, the third embodiment has detection means for detecting switching between the left and right eye in the sliding mechanism, and stores the position of the focus lens 27 in the fundus observation photographing mode corresponding to the left and right eye. Keep it. Then, the fundus observation imaging mode is returned again, and when the left and right eyes are switched, the focus lens 27 is moved to the position stored corresponding to the detection result of the detection means and each mode.

  The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

  18: Anterior ocular segment observation lens control unit, 19: Diopter correction lens control unit, 20: White LED control unit for photographing, 21: Infrared LED control unit for observation, 22: Infrared LED control for anterior segment illumination hot water Part, 23: control part

Claims (18)

A focus lens movable on the optical axis between the eye to be examined and the imaging means;
An anterior ocular segment observation lens for imaging the anterior ocular segment of the eye to be examined on the imaging means;
When the anterior ocular segment observation lens is inserted on the optical axis, the focus lens is moved to a predetermined position on the optical axis, and the anterior ocular segment observation lens is retracted from the optical axis when said of the fundus diopter correction lens for correcting the diopter of the subject's eye after being captured has been inserted on the optical axis by the imaging means, the said focusing lens prescribed in A control means for moving the anterior ocular segment observation lens to a diopter positive position that is a position corresponding to a state in which the anterior ocular segment observation lens is retracted from the optical axis;
An imaging device comprising: The light source control means for controlling start and stop of light emission of a light source that irradiates light to the eye to be examined according to retraction or insertion of the anterior ocular segment observation lens with respect to the optical axis. Item 2. The imaging device according to Item 1 . An objective lens disposed on the optical axis;
A perforated mirror disposed on the optical axis;
The anterior segment observation lens imaging apparatus according to claim 1 or 2, characterized in that disposed between the perforated mirror and the objective lens. A diopter correction lens for correcting the diopter of the eye to be inspected that can be inserted into the optical axis and can be retracted from the optical axis is disposed between the focus lens and the perforated mirror. The imaging apparatus according to claim 3 . It said predetermined position, 0D (zero diopter) imaging apparatus according to any one of claims 1 to 4, characterized in that a position. An anterior ocular segment observation mode for imaging the anterior ocular segment of the eye to be examined on the imaging means; a fundus oculi observation imaging mode for performing at least one of observation and imaging of the fundus oculi of the eye to be examined; the imaging apparatus according to any one of claims 1 to 5, further comprising a switching means for switching the mode between the anterior segment imaging mode for imaging of the eye. The switching means switches from the fundus observation imaging mode or the anterior segment imaging mode to the anterior segment observation mode in accordance with insertion on the optical axis by the anterior segment observation lens. Item 7. The imaging device according to Item 6 . It said switching means, in response to the anterior portion observation lens is retracted from the said optical axis, to claim 6 or 7, characterized in that switching to the fundus observation image pickup mode from the anterior portion observation mode The imaging device described. The switching means switches from the fundus oculi observation imaging mode to the anterior ocular segment observation mode in accordance with insertion on the optical axis by a diopter correction lens used in the anterior ocular segment imaging mode. The imaging device according to any one of claims 6 to 8 . When the focus lens is moved from a position set corresponding to the corresponding mode in the fundus observation imaging mode or the anterior segment imaging mode, the focus lens corresponding to the mode is moved. the imaging apparatus according to any one of claims 6 to 9, further comprising a setting means for resetting the position. A detection means for detecting switching of the left and right eye to be examined;
The control means, any one of the claims 6 to 10, characterized in that moving the focus lens to the position set in correspondence to the switched mode and the detection result and said switching means by said detecting means The imaging device according to item. The imaging apparatus according to any one of claims 1 to 11 , further comprising display control means for causing the display means to display image data of the anterior eye portion of the eye to be inspected imaged by the imaging means. The imaging apparatus according to any one of claims 1 to 12 , further comprising mounting means for fixing the imaging means in a removable state with respect to the imaging apparatus. The control means is configured such that the fundus of the eye to be examined is imaged by the imaging means and the anterior eye part of the eye to be examined is taken by the imaging means in a state where the anterior eye observation lens is retracted from the optical axis. The imaging apparatus according to any one of claims 1 to 13 , wherein the focus lens is moved to a diopter correct position before imaging. A focus lens movable on the optical axis between the eye to be examined and the imaging means;
An anterior ocular segment observation lens for imaging the anterior ocular segment of the eye to be examined on the imaging means;
When the anterior ocular segment observation lens is inserted on the optical axis, the focus lens is moved to a predetermined position on the optical axis, and the anterior ocular segment observation lens is retracted from the optical axis When a diopter correction lens for correcting the diopter of the subject eye is inserted on the optical axis before the anterior eye portion of the subject eye is imaged by the imaging means , the focus lens is Control means for moving to a diopter correct position that is a position different from the predetermined position and corresponding to a state in which the anterior ocular segment observation lens is retracted from the optical axis;
An imaging device comprising: A control method for an imaging apparatus, comprising: a focus lens movable on an optical axis between an eye to be examined and an imaging means; and an anterior ocular segment observation lens for imaging the anterior eye part of the eye to be examined on the imaging means. And
When the anterior ocular segment observation lens is inserted on the optical axis, the focus lens is moved to a predetermined position on the optical axis, and the anterior ocular segment observation lens is retracted from the optical axis when said of the fundus diopter correction lens for correcting the diopter of the subject's eye after being captured has been inserted on the optical axis by the imaging means, the said focusing lens prescribed in And a control step of moving the anterior ocular segment observation lens to a diopter correct position that is a position corresponding to a state in which the anterior ocular segment observation lens is retracted from the optical axis. Method. A control method for an imaging apparatus, comprising: a focus lens movable on an optical axis between an eye to be examined and an imaging means; and an anterior ocular segment observation lens for imaging the anterior eye part of the eye to be examined on the imaging means. And
When the anterior ocular segment observation lens is inserted on the optical axis, the focus lens is moved to a predetermined position on the optical axis, and the anterior ocular segment observation lens is retracted from the optical axis When a diopter correction lens for correcting the diopter of the subject eye is inserted on the optical axis before the anterior eye portion of the subject eye is imaged by the imaging means , the focus lens is An imaging apparatus comprising: a control step of moving the anterior ocular segment observation lens to a diopter normal position that is a position different from the predetermined position and corresponding to a state of being retracted from the optical axis Control method. The program for making a computer perform each process of the control method of the imaging device of Claim 16 or 17 .

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